The building, that forms the original nucleus of the fortified borgo of San Gregorio da Sassola, is characterized by powerful walls crowned with merlons, a drawbridge, a line of crossed windows situated on the first floor and a quadrangular tower. The well conserved draw bridge, under which passes the road that that leads to the inside of the inhabited centre of San Gregorio da Sassola, come in the scenic medieval complex to be explored by foot. On the side overlooking the medieval part of town, inside the castle's high walls, is a spacious courtyard, with another building set perpendicular to the rear façade off the main building.